|Pos|No|Driver|Constructor|Laps|Time/Retired|Grid|Points|
|---|---|---|---|---|---|---|---|
|1|9|Kimi Räikkönen|McLaren-Mercedes|44|1:30:01.295|2|10|
|2|5|Fernando Alonso|Renault|44|+28.394|4|8|
|3|3|Jenson Button|BAR-Honda|44|+32.077|8|6|
|4|7|Mark Webber|Williams-BMW|44|+1:09.167|9|5|
|5|2|Rubens Barrichello|Ferrari|44|+1:18.136|12|4|
|6|11|Jacques Villeneuve|Sauber-Petronas|44|+1:27.435|14|3|
|7|17|Ralf Schumacher|Toyota|44|+1:27.574|5|2|
|8|18|Tiago Monteiro|Jordan-Toyota|43|+1 Lap|19|1|
|9|15|Christian Klien|Red Bull-Cosworth|43|+1 Lap|16||
|10|12|Felipe Massa|Sauber-Petronas|43|+1 Lap|7||
|11|19|Narain Karthikeyan|Jordan-Toyota|43|+1 Lap|20||
|12|21|Christijan Albers|Minardi-Cosworth|42|+2 Laps|18||
|13|20|Robert Doornbos|Minardi-Cosworth|41|+3 Laps|17||
|14|10|Juan Pablo Montoya|McLaren-Mercedes|40|Collision|1||
|15|8|Antônio Pizzonia|Williams-BMW|39|Collision|15||
|Ret|16|Jarno Trulli|Toyota|34|Accident|3||
|Ret|14|David Coulthard|Red Bull-Cosworth|18|Engine|11||
|Ret|1|Michael Schumacher|Ferrari|13|Collision|6||
|Ret|4|Takuma Sato|BAR-Honda|13|Collision|10||
|Ret|6|Giancarlo Fisichella|Renault|10|Accident|13||

Question: how many competitors in the 2005 belgian grand prix did not finish the race?
Answer: 5